estimate vs forecast

estimate

noun
  • An upper limitation on some positive quantity. 

  • A rough calculation or assessment of the value, size, or cost of something. 

  • A document (or verbal notification) specifying how much a job is likely to cost. 

verb
  • To judge and form an opinion of the value of, from imperfect data. 

  • To calculate roughly, often from imperfect data. 

forecast

noun
  • An estimation of a future condition. 

  • exacta 

  • A prediction of the weather. 

verb
  • To estimate how something will be in the future. 

  • To foreshadow; to suggest something in advance. 

How often have the words estimate and forecast occurred in a corpus of books? (source: Google Ngram Viewer )